I'm able to normaly use dead keys over the whole system.
FYI I live in Brazil and we use accented letters, as in é á ó ã õ.
We need dead key support for this as we type first the accent key " ´ " and then the proper key " a " to get and á
It doesn't work in terminals like 'st' and 'urxvt' tough. I've searched thoroughly over the internet to no avail.
Change keyboard layout (English UK) on command line to English US doesn't solve my problem, as it is urxvt and st related.
Modern terminals like "tilix" or "gnome-terminal" are able to produce "á é é" characters